Let's Encrypt validation server ? Is this legit?

[termaine]

Hi,
My server is being checked out by this agent regularly everyday, is this a legit LE activity?

I do not know why it is checking everyday since I am not asking for new certs everyday at all.

GET

/.well-known/acme-challenge/XXX-XXXXXX_mw2kLrhbGZY-XXXX

User agent
Mozilla/5.0 (compatible; Let’s Encrypt validation server; +https://www.letsencrypt.org)

IP of the agent

2600:1f16:269:da00:4ec6:1cf7:34d5:6263

EDIT:
Hmm maybe not, investigating. Looks like there has been a problem with one of the domains

[mnordhoff]

You’ve edited your post, but FWIW, it is a legitimate IP.

[termaine]

Thanks, It looks like one of my domains was blocking LE agent, so the script has been trying it regularly.

[Phil]

That IP is one of our remote validation authority IP addresses. These IP addresses are subject to change at any given time as we turn up/down different remote validation servers.